Toggle mechanism for presses



Jan. 6, 1942. A. o. GATES ETA; 2,269,308

TOGGLE MECHANISM FOR PRESSES Filed sept. 7, 1937 2 sheetsfsheem Jan. 6, 1942. A. o. GATES ETAL 2,269,308

',-TOGGLE MECHANISM FOR PRESSES Filed sept. '7, 1957` 2 sheets-sheet 2 Patented Jan. 6, 1942 'UNITED STATES PATENT OFFICE TOGGLE MECHANISM F OR PRESSES Arthur 0. Gates, Otto H. Pearson, and George F. Pearson, Salt Lake City, Utah, assignors, by

mcsne assignments, to

Lake City, Utah Nicholas L. Strike, Salt Application September 7, 1937, Serial No. 162,620

4 Claims.

Our invention relates to laundry presses and has for its object to provide a new toggle action for operating the press angl for applying a iinal pressure to the material being pressed after the pressing bucks have been engaged.

A further object is to provide a newy toggle mechanism which will bring a movable element into contact with a stationary element and after little exertion of power but with great pressureV developed.

A still further object is to provide a pressing machine in -which a movable buck is brought into pressing contact with a stationary buck and then by intermediate expansion of the toggle' operating mechanism to exert greater pressure on the material between the two bucks by an eccentric operated directly by the power mechanism which drives the movable buck.

'Ihese and other objects we accomplish with the device illustrated in the accompanying drawings in which similar numerals and lettersy of reference indicate like parts throughout the several views and as described in the specification forming a part of this application and pointed out in the appended claims.

In the drawings Figure 1 is a partial diagrammatic section of one of ourpresses showing the toggle and operating cylinder in inoperative position with the pressing bucks open. Y

Figure 2 is a rear view of our new toggle connection removed from the press.

Figure 3 is an end view of the eccentric crank arm used in lengthening the toggle for additional pressure at the end of the power stroke.

Figure V4 is a face view of the crank arm eccentric.

Figure 5 is a diagrammatic partial section of the press similar to Figure 1 but with the bucks engaged and the eccentric operated to press the clothes, with padding shown on the lower buck which was not 'shown in Figure 1.

Figure 6 is a diagrammatic view of the action of the toggle and eccentric crank arm shown to represent the position when not operating or with the pressing bucks open.

Figure 7 is a diagrammatic view of the toggle action and of crank arm shown in the closed press position.

Figure 8 is a diagrammatic view of the toggle action and crank arm with the presses closed and the additional pressure applied through the action of the eccentric crank arm.

Figure 9 is a diagrammatic view showing means for adjustment of the toggle stop.

This application is a continuation in part of our former patent application for Automatic iluid connection for toggle actions, filed Feb. 24, 1937, Serial No. 127,352, now Patent No. 2,171,235.

In the drawings in which we have shown ourl device the framework standard in which our entire pressing machine is mounted and carried is shown as A, with the rear side raised into a vertical pivotal support member B, for the movable pressin-g buck arm 5 to .be supported on and with movable buck C mounted on the end of the arm 5 and with a stationary buck D mounted on the table E above the base of the framework standard A. The movable buck C is mounted on the end of thebuck arm 5 with the buck arm pivoted on the pivot 6 in the support member B. The end or the buck arm 5 is mounted to a clevis 8 vby a pin 9 and the clevis is connected to an adjustable threaded shaft I0. The lower end of the shaft I0 is screwed into a clevis II and an adjustment nut I2a is provided for manual adjustment of the toggle connection of which the bar I0 is a portion. The lower bifurcated end of the clevis II is connected to an actuating eccentric crank arm I2 on the extended arms I3 thereof.

The crank lever arm I2 is T-shaped in elevation with the main body or stem of the T connected to the power cylinder 22 and with the cross of the T connected into the medial joint of the toggle by the connection of the arms I3 and the clevis Il. Extending beyond-the ends of the arms I3 are the eccentric crank arms I4 and I5 which are connected onto the two sides of an H-shaped lower arm I'I of the .toggle mechanism thus making the arm I2, with its respective arms I3 and I4 and I5 on each side, the pivotal connection at the medial. joint of the power toggle for actuating the press. This arm member I1 of the toggle is connected onto the two arms I4 and I5 and the lower end of the member I1 is pivotally mounted to the -frame of the T The shaft I8 isI connecting rod has its other end attached to thel 2 piston .(not shown) of the power cylinder 22. The pin 20 is extended on each side of the end 23 and carries two ball bearing mounted rollers 24 which rollers engage on an inclined plane K mounted on the shaft I8 and set to the framework A by suitable adjustment bolts, which are passed through the cross plate 28 at the rear of the press framework A and a wedge member 25. The front engagingv face of the inclined plane K is formed on a sloping incline so that when the cylinder is actuated forcing the piston outward the connecting rod 2l will force the rollers 24 against the face of the inclined plane and will raise the rollers as the piston continues to .operate until they pass up over the face or incline and they leave the top of the inclined'plane when the nal pressure is being applied by the action of the eccentric ends of the crank lever arm I2. This action causes the movable buck to engage the stationary buck and press the clothing there between.

In Figures 6 to 8 inclusive this action is shown very clearly as to the different positions assumed by the toggle arms and the crank arm showing the additional pressure applied by the crank arm when the presses have been engaged. The stop S at the rear of the press frame A is engaged by the H-s'haped lower arm I1 and holds the' toggle Y from further rearward movement while the crank-arm I2 is being pressed still farther to the rearward by continued pressure from the power cylinder 22, thus compensating for any Wear on the padding of the buck andA keeping the same pressure on the clothing being vpressed at all times. The position of the stop S may be vvaried when the press is set up ready for operation and when desired it may be moved forward or back# Cil Having thus described our invention we desire to secure by Letters Patent and claim:

1. In a toggle mechanism for presses, the com bination of a pressing arm, a framework on which said arm is pivotally mounted, .a toggle link pivotally connected at its upper end with one end of said pressing arm, a T-fshaped crank device having a horizontal arm provided with offset crank pins at its ends, and a downwardly extending leg rigidly connected to and perpendicular to the arm, said toggle link being pivotally connected at its lower end to Said arm of the crank device on an axis parallel to the aXis of the arm, an H-shaped lower toggle link pivotally connected at its'upper end with said crank pins and at its lower end pivotally connected with said frame, a stationary inclined plane having an upwardly inclined track located between the legs of the H-shaped lower toggle link, rollers on the free end of the leg, and means to guide said rollers along the inclined plane and to raise the same thereby to straighten said toggle and to thereafter operate upon said crank v device to rotate the arm and thereby vary the length of the toggle.

2. In a toggle mechanism for presses the combination of a pressing arm; a framework `on which said arm is pivotally mounted; a toggle ward by suitable adjustments such as are shown in Figure 9 of the drawings. member 30 is provided with a'longitudinal slot through the center thereof to allow for loosen ing of the bolts 3l and forward or rearward adjustment of the stop S by sliding the wedge either up or down on the bolt as desired.

In this continuation of our former patent application referred to heretofore We have not shown our cylinder for vadjusting the length of the upper arm of the toggle but it is understood that such modifications or changes may be made in the construction of the device such as the addition of the cylinder or other changes without departing from the spirit of our invention or the scope of our claims.

This device may be so adjusted that when light pressure is desired the toggle levers or the bar I0 may beset so that the rollers 24 travel up the face of the inclined plane K and never rise above the extreme top end thereof but for higher pressure may be set so that the rollers travel up the face of the inclined plane K, and when reaching the peakwill leave the upper curved surface of the inclined plane and thel action of the crank arm will then come into play to add the extra pressure needed for pressing the clothes as the padding on the buck wears down the crank arm will travel farther to compensate for such wear automatically without any manual adjustment of any of the parts. When the paddling is replaced or more padding added it is not necessary to make any adjustment of the parts of the press for the crank arm takes care of such padding and the v degree of` movement of the crank arm will be lessened.

fil

or to compensate for Wear the toggle The wedge shaped link vpivotally connected at its upper end with one end of said pressing arm; a T-shaped crank device having horizontal arms provided with offset crank pins at its ends and a downwardly extended leg said toggle link being pivotally connected at its lower end to said horizontal arms; a lower toggle link pivotally connected at its upper end to said crank pins and at its lower end pivotally connected to said framework; an inclined plane mounted in alignment with the extended leg of the crank device; rollers mounted on the lower end of said leg of said crank device to ride said inclined plane; and motor means to drive said leg forward to engage the rollers on said inclined plane and raise the toggle mechanism and thereby straighten it and to change the angle of said crankldevice relative to the lines and thereby vary the length of the toggle.

3. In a pressing machine the combination of a movable and a stationary buck, with an inclined plane over which rollers for actuating a toggle mechanism are operated; a toggle mechanism for operating the movable buck; means to actuate said toggle mechanism; saidl means including an eccentric crank arm mounted with one leg attached to the power mechanism so that when the rollers leave the inclined plane the toggle mechanism and crank arm will automatically exert high pressure and follow up wear on the padding of the stationary buck.

4. In a toggle mechanism for presses, the combination of an upper and lower toggle arm connected into coactingrelation by a T-shaped crank device having the outside end portion of the arms of 'thei T-shaped head eccentric, with the upper toggle arm connected to the noneccentric portion of the head and the lower toggle arm connected to the eccentric outside portion of the crank device, said crank device to be actuated to straighten and lengthen said toggle arms and exert high pressure after a predeter mined portion has been reached by the toggle arms.

ARTHUR O. GATES. O'ITO H. PEARSON. GEORGE F. PEARSON. 

